Here you can find the source of round(double num)
public static double round(double num)
//package com.java2s; /**/* w w w . j a va 2 s . c om*/ * Copyright (C) 2007-2009 Alexis Kinsella - http://www.helyx.org - <Helyx.org> * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ public class Main { public static double round(double num) { double floor = Math.floor(num); if (num - floor >= 0.5) { return Math.ceil(num); } else { return floor; } } }